How close is too close to a contaminated site?

There is no distance that answers it, because groundwater and vapour move directionally rather than in circles. A property down-gradient at a mile can be affected where one up-gradient at a quarter mile is not. The site's own file, which states the contaminants and whether groundwater is involved, is what determines whether distance matters at that location.

Will a mortgage lender care about a nearby Superfund site?

For residential lending, usually not directly. For commercial lending it is routine: lenders typically require a Phase I ESA, and SBA loan programmes have their own environmental investigation requirements tied to the property's use and history.

Can I back out of a purchase over environmental findings?

That depends on the contingencies in the contract. An inspection or due diligence contingency broad enough to cover environmental findings is what preserves the option, and it needs to be in the contract before findings arrive. This is a point to raise with an attorney at drafting, not after.

Guides

Buying a house near a contaminated site

What to read, what to test, what to ask, and where the line is between diligence you can do yourself and work that needs a professional.

Updated 2026-09-03 - 7 min read

Start with what the record says, free

Before spending anything, establish what exists. The county page here lists every NPL site, federal cleanup site, toxic release reporter and fuel tank record on file locally, and the free address check narrows that to what sits near one specific address.

Two numbers matter more than the rest: whether anything is within a mile, and whether any open fuel-release cleanup is nearby. Those are the two findings most likely to affect a specific parcel rather than a general area.

Read the primary documents, not summaries

For any nearby NPL site, read the EPA listing narrative and the most recent five-year review. They are written for the public, they name the contaminants, and they state whether the remedy is working.

For fuel releases, the state's tank programme file is public and usually obtainable by request or online search. An open release means cleanup has not reached 'no further action', which can mean active remediation or simply a long monitoring tail.

For anything else, the state environmental agency's site database is the layer beneath the federal one. Many contaminated sites are managed entirely at state level and never appear in federal data at all, which is the single biggest gap in any federal-only report, including this site's.

Test the things that are cheap to test

Radon: a test kit costs $15 to $40 and answers definitively for that building. Do this regardless of what else is nearby.
Well water, if there is a well: a certified lab panel plus a PFAS panel. No public system testing covers a private well.
Vapour intrusion, if a nearby site involves volatile compounds such as TCE or PCE and the property is close: this needs a professional, and it is the one residential test worth paying real money for in that specific situation.
Lead: relevant for any house built before 1978 for paint, and for any property whose water system's inventory shows lead service lines.

Questions worth asking in writing

Ask the seller whether they have received any notice from an environmental agency about the property, whether the property has ever had an underground tank, and whether any deed restriction or institutional control applies. Answers in writing, on the disclosure form, are what matter later.

Ask the water utility directly for the most recent Consumer Confidence Report and the lead service line inventory entry for that address. Both are public and utilities are used to the request.

Ask a local real estate attorney what the state's disclosure standard actually requires. This varies enormously and general advice is worthless here.

When to hire a professional

For a residential purchase with nothing close by, reading the record and running the cheap tests is proportionate diligence.

For a residential purchase where a site is within a mile and involves volatiles or groundwater, or where the property has any tank history, an environmental consultant's opinion is worth its cost against the size of the transaction.

For any commercial or mixed-use purchase, or any purchase financed by an SBA loan, a Phase I ESA is effectively mandatory and is the only route to the innocent landowner defence under CERCLA. Nothing sold to consumers, including our report, substitutes for it.

Common questions

How close is too close to a contaminated site?: There is no distance that answers it, because groundwater and vapour move directionally rather than in circles. A property down-gradient at a mile can be affected where one up-gradient at a quarter mile is not. The site's own file, which states the contaminants and whether groundwater is involved, is what determines whether distance matters at that location.
Will a mortgage lender care about a nearby Superfund site?: For residential lending, usually not directly. For commercial lending it is routine: lenders typically require a Phase I ESA, and SBA loan programmes have their own environmental investigation requirements tied to the property's use and history.
Can I back out of a purchase over environmental findings?: That depends on the contingencies in the contract. An inspection or due diligence contingency broad enough to cover environmental findings is what preserves the option, and it needs to be in the contract before findings arrive. This is a point to raise with an attorney at drafting, not after.

Want to know what applies to one specific address? The free check reports what is on the federal record near it, and says plainly when nothing is. Check an address

Umwelt publishes public records and explains the standards that govern them. This is not legal, engineering, environmental consulting or medical advice, and it does not assess any specific property or person.